Quote:
Originally Posted by NTIMID8R
Remove the spark plug for that cylinder and use an air blower with a rubber tip and see if it will move back up with a little air pressure. Better than prying up on it and risk bending it if it's not bent yet. Like others said, may just be gunked up. Also works if you need to change a valve spring.
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This is a good idea but a better one is to actually pressurize the cylinder then tap gently on the top of the valve stem. This will help it become unstuck and allow it work properly.
You only need a few psi for this to actually function.